1

Why Supplements?:
Since you're 17 years old, I am concerned that you are spending time and money wasting it on the supplements that you listed. While some of the substances are present in a healthy diet, there is actually no reason you should be taking them in the form of a supplement. You should be getting all the vitamin D you need in a healthy diet, and the other things, except Prilosec, are unproven.
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A gas that can directly relax vascular smooth muscle. It is used in the critical care setting to treat pulmonary hypertension. This can be seen in premature neonates with bronchiopulmonary dysplasia or neonates with congenital heart disease. It may be used in adults with severe pulmonary hypertension of various causes.
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2

Should be fine:
I don't see any significant problems taking all of these supplements. If you have any side effects, however, it may be a challenge to know which is the culprit. Typically, side effects from these are minimal or not existent.
If you are taking the prilosec due to the others causing GI complaints, you may want to reconsider this strategy.
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3

Your review is wise:
There are no noted interactions between these substances and each other but each may have interactions with other substances. If you are on or plan to be on other substances or medications, advise doctor and pharmacist so interactions may be reviewed. Best regards for your health and well-being.
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5

NO:
In general, MAO inhibitors refer to specific prescription antidepressant drugs & are highly regulated. Many foods & herbs have mild MAO inhibiting actions, such as carrots, chocolate, coffee, ginger, grape & onions,but these effects are not clinically significant & they don't need to be avoided if on a med that interacts with MAO inhibitors:
http://www.botanical-online.com/english/vegetalmaois.htm
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6

Many uses:
Nitric oxide functions as a signaling molecule (neurotransmitter) telling your body to make blood vessels relax and widen. Bodybuilders and athletes may use Nitric Oxide for blood flow, oxygen delivery, glucose uptake, muscle velocity, power output, and muscle growth. There are side effects associated with this supplement. Do your homework. How about balanced eating with whey protein.
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8

No:
there is no interaction between these amino acids and the prilosec, msm, or glucosamine You should be just fine Make sure the prilosec does not stop acid production in your stomach because you need the acid to absorb some of the medications and vitamins
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10

Yes, but not by much:
Human growth hormone can be stimulated by a number of ways, but the stimulation will not significantly increase the daily 24hr amount in any given person. Put another way, one may produce a spirt of hgh by taking l-arginine but the additional amount is just a drop in the bucket when compared to the 24hr amount of hgh that the body make. The best way to increase hgh levels is by DX and rx.
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13

No:
There are some "nitric oxidesupplements" on the market used by weight lifters for muscle building. Actually Nitric Oxide is a gas produced spontaneously by the body that is important in a number of biologic processes. There is no evidence that "supplements" alter this significantly. For those weight training, a healthy diet, adequate hydration and proper technique are the keys to strength gains.
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20

See below:
Nitric oxide dilates blood vessels & thus increases blood flow. Ginkgo thins the blood. So their is possibility of bleeding problems if both are taken, especially if one also takes ndaids or coumadin (warfarin). Discuss the benefit-risk ration of these 2 with your fp or internist or hematologist.
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